Improvement in unison-stops for printing-telegraphs



T. A. EDISON.

'Improvemnt i n Unison-Stops for Printing-Telegraphs.

No. 131,344. Patented Sep.17,1872.

INVENTOR ATTY.

UNITED STAT S PATENT QFFIOE.

THOMAS A. EDISON, OF NEWARK, NEW JEEsEY.

IMPROYEMENT INUNISON-STOPS FOR PRINTING-TEL EGRAPHS.

Specification forming part of Letters Patent No. 131,344, dated September 17, 1872.

To all whom it may concern:

Be it known that I, THOMAS A. EDIsoN, of Newark, in the county of Essex and State of New Jersey, have invented an Improvement in Printing Telegraphs; and the following is declared to be a correct description of the same.

This invention is devised for rotating the type-wheel aroundto a unison-point bythe action of a wedge-shaped tooth on the printing-lever operating upon a toothed wheel on the type-wheel shaft; thereby a number of machines in an electric-circuit are brought to a unison-point by pulsations through the printin g-lever.

In the drawing, Figure 1 is a section showing the type-wheel and wedge-acting escapement, and Fig. 2 is a detached view of the unison-wheel and tooth.

The bed f, type-wheel Z, shaft 9, printingmagnet m, type-wheel magnet h, and printinglever m, are of the usual character. The wedgeacting pallets t i of the type-wheel lever h act upon the ratchet-wheel 7c, and give the type-wheel l a progressive movement, step by step, the pallets z being placed so that the type-wheel is moved half a space as the magnet h is energized, and the other half space is moved by the spring 8 acting upon the lever h, when the pulsation in h is arrested. Upon the printing-lever m is a pallet or tooth, 60, and upon the typewheel shaft 9 is a toothed wheel, is, with one tooth removed at the point where the type-wheels will be brought into unison.

The operation is as follows: Ordinarily the impression from thetype-wheel by the printingpad 19 will be made when the circuit through h is broken, and the parts in the position shown in Fig. 1, in which case the tooth 60 moves in between the teeth of 70 without acting to turn the same; but when the machines are to be brought to unison, the circuit through h is kept closed, and the pallet 2' moves the type-wheel Z and wheel k half a space, so that the latter is in the position to the tooth 60, shown in Fig. 2; the printingmagnetm is then energized by a series of pulsations, and as the printinglever m moves, the tooth 60 rotates the wheel k and type-wheel l around until the space 10, formed by the removal of one of the teeth of it, reaches the tooth 60, and hence there can'be no further motion of the type-wheel, because the tooth 60 has nothing to act against, and thereby the type-wheels of the various printing-telegraph machines in the line will all stop when they arrive at the unison-point, even though the levers m are still operated to bring into unison any type-wheels that may not have arrived at that point. During these motions, the upper pallet 43 yields as the shaft g and wheel is are turned, and this pallet t acts as a pawl to prevent a reverse movement. The type-wheel will not be printed from in these movements, because the pad 19 is brought up at the space between one type and the next, the pallets 1' being in the reverse position to that occupied by them when the printing is effected.

I claim as my invention '1. The wheel 70 and tooth 60, actuated by the printing-lever m, in combination with the type-wheel l, wheel k, and pallets z, substantially as and for the purposes set forth.

2. Adjusting the type-wheel to the unisonpoint by the movement of the printing-lever while the type-wheel pallets are in the opposite position to that which they occupy when the type-wheel is being printed from, substantially as set forth.

Signed by me this 29th day of June, A. D.

' T. A. EDISON.

Witnesses:

GEO. D. WALKER, GEo. T. PINCKNEY. 

